• char_type : mptl::fifo_stream< fifoT, deviceT > , mptl::terminal< Tp, _terminal_echo > , poorman::ostream< Tp >
• resources : mptl::terminal< Tp, _terminal_echo >
• stream_device_type : mptl::terminal< Tp, _terminal_echo >
• tx_stream_type : mptl::terminal< Tp, _terminal_echo >